The Research On Survey New Technology Application For Forest Operations

Modern forest operation system is continuously transforming into ecosystem forestry andprecision forestry, and the spatial position accurate determination and information real-timeobtaining in modern surveying technology is one of the important technologies that are appliedto carry out ecosystem forestry and precision forestry. The core of modern surveyingtechnology is the satellite position, geography information system, remote sensing and surveydata processing, etc. The technology can help to rapidly, accurately, real-time obtain variousgeography information and promote the rapid development and progress of multiple industries.In this articlelSatellite difference position would be applied in the forest operation system. AGNSS single base station would be founded at the forest homework area. The coordinateconversion between the satellite coordinate system and the nation or local coordinate system,the solution of GNSS single base station system, the GNSS\DR combination navigate theory ofmachine, the combined positioning based on laser measure and of GNSS difference positionand the information collected according to mobile GIS at the forest area would be researched.In this text, the main research work and conclusion are as follows:1. The GNSS difference position would be applied on the forest operation system. Based on theenvironment characteristics of the forest area and the principle of the GNSS single base stationsystem, the basis request and principle of building GNSS single base station system would bestudied on the forest homework area, put forward the technique request of the address choice,equipments choice, and communication method, etc. With the GNSS single base station systemthat would be established at the forest homework area, the address environment and the qualityof sending out and receiving data would be tested completely.2. According to the coordinate conversion principle of four parameters, put forward thecoordinate conversion method between the satellite coordinate and nation or local coordinate atthe forest area. It takes the mean elevation plane of the forest area as projection plane, thelongitude in the district center as the central meridian longitude. And then, according Gaussprojection, the spatial coordinate of the satellite coordinate system would be projected the planerectangular coordinate of the satellite coordinate system, then, the coordinate conversionparameters would be calculated with the plane rectangular coordinate between the satellitecoordinate system and nation or local coordinate system. The coordinate conversion course isquick, simple, and, can meet the accuracy request of each survey item in the forest operationsystem.3. In this text, compare and analyze the ambiguity solution methods of double differenceobservation, point out that it is the relatively suitable method with Least-Square Ambiguity Decorrelation Adjustment to solute the ambiguity of double difference observation betweenmoving station and virtual reference station in the GNSS single base station system of the forestarea and prove that the effect of the method is better through experiment.4. According to the error source of the satellite position, conceding the characteristics oftroposphere, multi-path effects and height change at the forest area, put forward and improvedtroposphere correct model to weaken the influence of troposphere, and adopt the CVVF methodto filter observed value and weaken the influence of multi-path effects.5. The GNSS difference position would be applied on the machine and vehicle navigation at theforest homework area. When the satellite signal is occlusion, the integrated navigation based onthe information of GNSS difference and DR would be applied to solve the shortage of thesingle navigation system, and build up the observation equation and motion state equation ofvehicle at the forest homework area, put forward the SUEFK algorithm to process data fusion.This algorithm simplifies the process of data fusion, but does not lower the navigation accuracyof vehicle at the forest homework area.6. Integrate the Laser Ranging, GNSS, and the PDA technique, establish the data fusioncalculation model of laser ranging and satellite based on the PDA, develop the differencecombination location program of laser ranging auxiliary GNSS and realize accurate locationwhen GNSS signal is break off in the forest homework area.7. Put forward an integration homework method of forestry information collection, and developa data collection system and an information collector based on mobile GIS and CombinedPositioning of laser ranging auxiliary GNSS. These can be used to surveying and investigatingof resources at the forest operation area and realize the internal and external integration ofcollection of forest information.In this text, the satellite position technology was used successfully into the forest operationsystem, and some hard technique of the forest homework process was solved. This may play arole in realizing intelligence of the forest operation system, and may have important guidingsignificance in developing of new technology and new theoretical research of surveying as wellas application in the forest operation system.